Acoustic signaling apparatus



1930. e. A. ZEININGER 138E930 ACOUSTIC smmmue APPARATUS Filed March .51. 1923 Patented Dec. 30, 1930 UNITED STATES PATENT OFFICE GUSTAV ADOLF ZEININGER, OF OBERESSLINGEN. GERMANY, ASSIGNOR T ROBERT BOSCH AKTIENGESELLSCHAFT, OF STUTTGART, GERMANY ACOUSTIC SIGNALING APPARATUS Application filed March 81, 1928, Serial No. 266,260, and in Germany May 21, 1927.

The present invention. relates to arrangements for resiliently mounting acoustic signaling apparatus on a vehicle, and more particularly to that type in which the signaling apparatus, under the influence of the resilient mounting, is adapted to vibrate parallel to the vibrations of the diaphragm.

Heretofore such apparatus has been supported at one side only and as a. result of this unbalanced support the apparatus was caused to vibrate non-uniformly, that portion furthest from the resilient support or mounting vibrating with far greater amplitude than the portion connected to said support.

The principal object of the present invention is to provide a resilient mounting which will permit the housing and other parts of the apparatus to vibrate uniformly and in a direction parallel to the vibrations of the dia phragm. This involves so locating the resilient means that it permits substantially equal movement of all parts of the housing and other parts. Such a mounting permits the housing and other parts of the apparatus to be supported in such a way that the normal tone of the signaling means is not materially impaired.

' In order to obtain a simple mounting which is localized about the axis of the signal apparatus housing, a leaf spring, according to the preferred form of the invention. extends behind the housing and is mounted at its periphery on the signal apparatus and centrally on the vehicle. with the center: of the spring lying substantially on the axis of the diaphragm.

A11 electro-magnetic horn for motor vchi cles is shown in the accompanying drawings as an example of construction of the invention. in these drawings Figure l is rear elevation, and

Figure 2 is a longitudinal section.

The horn has a-cap-shaped housing 1 in which are mounted a diaphragm 3 connected with an axis 2 and .a-fiare 0r mouthpiece 4. Washers 5, on which the corners of a triangular leaf spring 7 are mounted by screws 6, are riveted to the base of the housing. A threaded bolt 9 carrying a nut 10 at its free end is riveted to the center of along with two discs 8.

A yoke 11 is mounted on the bolt 9 between the nut 10 and the outer disc 8, and encloses a tubular support 12 to which it can be firmly clamped by tightening up the nut 10.

The diaphragm 3 and the leaf spring are arranged parallel to each other and accord; iugly the vibrations of the body of the horn set up by the horn are absorbed by the leaf spring. The spring 7 therein does not project laterally beyond the housing 1 and for this purpose is given the form of an equilateral triangle svmmetrically of the axis of the housing with curved sides and corners.

Any other polygon, and in the limiting case a circle, may be used instead of the triangle. The leaf spring may also be replaced in known manner by a bundle of leaf springs.

I claim: i

the sprin 1. The combination, with acoustic signal-- ing means including a vibratory sound-producing member, and supporting means to which said signaling means is to be connected, of a resilient member, connected substantially at its center to one ofsaid means and adjacent its periphery to the other means, for supporting said signaling means, the center of said resilient member lying substantially on the axis of the vibratory sound-producing member.

2. The combination, with acoustic signaling apparatus including a housing and a sound-producing" diaphragm, ofmeans for mounting said apparatus on a vehicle, comprising resilient means secured to the vehicle and to the said housing, said resilient means being so located as to permit substantially equal movement of all parts of said housing.

3. Means for resiliently mounting an acoustic signaling apparatus to a vehicle, said apparatus including a housing and a sound-producing diaphragm, comprising a leaf spring arranged to the rear of said housing and transversely of the axis thereof, means for securing said leaf spring at a number of points adjacent its periphery to said housing, and means for securing said leaf spring substantially at its center to said vehicle, the center of said leaf spring lying substantially on the axis of the sound-producing diaphragm.

4. Means for resiliently mounting an acoustic signaling apparatus to a vehicle, said apparatus including a housing and a sound-producing diaphragm, comprising a leaf spring of regular polygonal shape arranged transversely of the axis of the housing so that a wall of said housing extends laterally beyond said leaf spring on all sides, means for securing said leaf spring at its corners to said housing, and means for securing said leaf spring substantially at its center to said vehicle, said leaf spring being so located as to permit substantially equal movement of all parts of said housing.

5. A support for acoustic signaling apparatus, said apparatus having a houslng and a sound producing diaphragm, comprising a,

leaf spring of regular polygonal shape hav-, ing a dimension less than the base of the housing of said apparatus, means for securing said spring at its corners to the base of said housingso that said spring lies parallel with the diaphragm of said apparatus, a bolt rigidly connected to-the center portion of said spring, a yoke throu h which said bolt passes, a tubular support or said yoke, and means to rigidly clamp said yoke to said tubular support, said leaf spring so located as to permit substantially equal movement of all parts of said housing.

In testimony whereof I have hereunto affixed my signature.

' GUSTAV ADOLF ZEININGER. 

